计算距离当前时间

  　　public string DiffTime(DateTime time)
        {
            TimeSpan nowTime = new TimeSpan(DateTime.Now.Ticks);

            TimeSpan releaseTime = new TimeSpan(time.Ticks);

            TimeSpan diff = nowTime.Subtract(releaseTime).Duration();
            if (diff.Days > 0)
            {
                return diff.Days + "天前";
            }
            else if (diff.Hours > 0)
            {
                return diff.Hours + "小时前";
            }
            else if (diff.Minutes > 0)
            {
                return diff.Minutes + "分钟前";
            }
            else// if (diff.Seconds > 0)
            {
                return diff.Seconds + "秒前";
            }
        }